Given that genetic factors exert a large effect on the phenotype and an intermediate to high narrow-sense heritability was observed, the copper concentration appears to exhibit a qualitative inheritance.

Heritability of adult ADHD appears even higher than that in children: whereas a sibling of a child with ADHD has a 3-4-fold increased risk compared to control children, this risk-increase is 17-fold for a sibling of an adult ADHD patient.

The current study by these investigators of a second cohort of 536 individuals from 162 Hispanic families found that insulin clearance was indeed a highly heritable trait, with an age-, sex- and body mass index-adjusted heritability rate of 70.

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